Carl gtjstaf larson



0. G. LARSON.

DEVICE FOR DRAWING TUBES.

Patented'June 2, I896.

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WITNESSESI ATENT OFFICE.

CARL GUSTAF LARSON, OF SANDVIKEN, SWVEDEN.

DEVICE FOR DRAWING TUBES.

SPECIFICATION forming part of Letters Patent No. 561,327, dated June 2,1896. Application filed July 8,1895. Serial No. 555,219. (No model.)Patented in England June 20,1895,N0.12,032.

To aZZ whom. it may concern.-

Be it known that I, CARL GUsTAF LARSON, a subject of the King of Swedenand Norway, rcsidingin Sandviken, Sweden, have invented certain new anduseful Improvements in Devices for Drawing Tubes, (for which a patenthas been granted to me in Great Britain, No. 12,032, dated June 20,1895,) of which the fol lowing is a specification.

My invention relates to a device to be substituted for tongs, whichlatter have hereto fore been very commonly used for gripping the tube indrawing it. These tongs present a good many inconveniences anddisadvantages, one being that they mark the tube, and another is thatspecial means must be provided to prevent them from crushing the tube.

My invention has for its object to provide a simple gripping devicewhich will avoid the disadvantages incident to the use of tongs. Thisdevice is illustrated in the acco1npanyin g drawings, wherein Figure 1is a longitudinal sectional view of the device in its simplest form.Fig. 2 is a similar view illustrating a form of the device where splitsleeves are employed, and Fig. 2 is a transverse section 011 line 2 inFig. 2. Fig. 3 illustrates a form where only one split sleeve isemployed.

Referring primarily to Fig. 1, a represents the. drawing-eye, and 1)represents a tapered core, which is connected with or integral with theeye a and tapers toward the latter. This core is roughened exteriorly bya screw-thread or circumferential grooves.

The tube a; to be drawn is split up or slitted at the end and the coreI) inserted. The slitted part of the tube is then compressed on the coreand a tapered sleeve 0 slipped over it and driven on. When power isapplied to the eye a in drawing the tube, the conical core 6 tends tojam the tube tightly between the core and the sleeve 0, whereby thestronger the pull is the tighter will be the grip on the tube.

The slitting of the tube may be avoided by using the rather more complexform of the device seen in Figs. 2 and 2. In this 0011- struction twosplit sleeves cl and fare employed, the former being placed inside ofthe tube and the latter outside, so that the latter is clamped betweenthe roughened faces of the said sleeves. The inner smooth face of thesleeve dis coned or tapered and the outer smooth face of the sleeve f istapered.

Fig. 3 shows a construction like that of Fig. 1, except that a splitsleeve (1 is employed inside of the tube.

If the tube be quite thin and the tapers be slight, the device, asillustrated in Fig. 1, may beemployed without slitting the tube.

The drawing-eye dis merely to afford a 0011- venient means of couplingthe drawing mechanism to the core Z). The core may be provided with anyform of coupling attachment for this purpose.

Having thus described my invention, I claim- 1. A gripping device foruse in drawing tubes and for similar work, comprising a core forinsertion in the tube provided with a coupling attachment at its outerend, said core bein g tapered and smallest at its outer end, and aplain, outer sleeve adapted to embrace the tube, said sleeve being alsotapered and smallest at its outer end, the inner surface of said sleeveand the outer surface of said core being substantially parallel, asshown.

2. A gripping device for use in drawing tubes and for similar work,comprising a core for insertion in the tube provided with a couplingattachment at its outer end, said core being tapered and smallest at itsouter end, a plain outer sleeve adapted to embrace the tube, said sleevebeing also tapered and smallest at its outer end, the inner surface ofsaid sleeve and the outer surface of said core being substantiallyparallel, and a tapered split sleeve embracing said core and adapted tofit within the tube to be drawn, as set forth.

3. A gripping device for use in drawing tubes and for similar work,comprising a tapered core b,which is smallest at its outer end where itis provided with a coupling attachment, an outer, tube-embracing sleeve,0, also tapered internally and smallest at its outer end, the innersurface of said sleeve being parallel with the surface of the core,- asplit sleeve, 61, tapered interiorly to fit the core I) and cylindricalexteriorly, and a split sleeve f, tapered exteriorly to fit within thesleeve 0 and cylindrical interiorly, substantially as set forth.

In Witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

CARL GUS'IAF LARSON. Witnesses:

ERNs'r SVANQVIST, CARL TH. 'SUNDHOLM.

